www.starfall.com - to ciekawa i bezpieczna strona dla dzieci, które wchodzą w świat czytania po angielsku.
https://quizlet.com/join/khyM5Y7Ep   - KET class (level A2) - vocabulary at Quizlet
https://www.englishgrammar.org/exercises/  - online grammar quizzes (level B1+)
http://learnenglishteens.britishcouncil.org/grammar-vocabulary/vocabulary-exercises - vocabulary games, level A2
https://www.examenglish.com/   - free practice tests for learners of English (Cambrige Exams, IELTS and others)